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Proceedings Paper

Optimizing grain size distribution in Nd:YVO4 powder pellets for random laser action with high efficiency
Author(s): Niklaus U. Wetter; E. Jimenez-Villar; Julia M. Giehl; Felix Butzbach; Victor Tayra
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Paper Abstract

We demonstrate a volumetric random laser with an optical efficiency of 15%. We use a 1.33 mol% Nd:YVO4 crystal, grind it and mix the particles into ten different size distributions with mean particle sizes ranging from approximately 10 micrometers to 100 micrometers. After pressing into pellets, each of the ten groups has its transport mean free path calculated from the distribution spectra and experimentally measured by means of its backscattering cone. We then calculate the fill fractions of each sample. The pellets are diode-pumped at 806.5 nm. Linewidth narrowing and output power are measured as a function of absorbed pump power. We demonstrate that the smaller particles, trapped between large particles, serve as gain centers whereas the large particles control the light diffusion into the sample. By optimizing diffusion and gain we achieve high slope efficiency.

Paper Details

Date Published: 17 February 2017
PDF: 9 pages
Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 1008216 (17 February 2017); doi: 10.1117/12.2256600
Show Author Affiliations
Niklaus U. Wetter, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
E. Jimenez-Villar, Univ. Federal de Pernambuco (Brazil)
Julia M. Giehl, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Felix Butzbach, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Victor Tayra, Instituto de Pesquisas Energéticas e Nucleares (Brazil)

Published in SPIE Proceedings Vol. 10082:
Solid State Lasers XXVI: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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